No Luck On Trying To Start Another Apple Tree In My Frig

I have been trying to reproduce the Apple Tree sprout that I found in my frig awhile back but no luck. I thought I was doing the exact same thing as before but I was not trying before.    I was hoping to have one growing and ready to plant outside before it got to hot but that isn't going to happen this year. I will keep trying and if it grows it will just have to stay inside until next Feb- March.